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IMPROVEMENT IN SAWS.

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TO ALL WHOM IT MAY CONCERN: ,l p

Be it known that I, DAVID SATTLEn, of Miiliin, in the county of Ashland, and State of Ohio, have invented new and useful Improvements in Saws; and I do hereby declare that the following is a full, clear, and exact description of my invention, reference beinghad to the accompanying dra-wingsfforming'a part of this specification, and to` the letters of reference marked thereon, of which drawingsl Figure 1 is a side view of a. cross-cut saw, with my improvements.

Figure 2 isa plan of the same.`

The nature of my invention consists -in the novel construction and arrangement of teethon'a cross-cut saw, said teeth consisting of'knife-teeth, planing-teeth, gauge-teeth, and clearing-teeth, which are so arranged on the sawthat the knii`e-teeth shall cut the sides of Ithe korf, and the planing-teeth vplane out the -centre of the keri, while the gauge-teeth are so arranged as to assist the knife-teeth in cutting the'sides of the kerf,and at the same time prevent the plsiting-teethl from taking too much feed in the' korf, and the clearing-teeth serve to carry outlet` the kerf the saw-dust that is not removed hy the planing-teeth, and also act in some degree as gauges' for thc planing-teeth..` i i The peculiar utility of my improved saw consists in the fact that, while possessing alll the advantages comf mon to the systeml of knife and planingteeth, it keeps much freer from saw-dust than any other saw, thereby lesseniug4 the amount of power required to operato it, while it has a much more uniform fecd -thn other saws with the knife and planing-teeth, as the novel construction of 'the gauge-teeth causes the feed to bel regulated by the movement of the endof said gauge-teeth over the path of the knife-teeth, where it is but little aiected by anysaw-dust in the korf, which has heretofore seriously affected theeiieiency. of this class of saws; andl another advantage resulting from the form of the gaugeteeth is, that the feed 'of the saw adjusts itself to the lumber to be sawed,` whereasull the former saws of this class have a uniform feed for all classes of timbcr,'or else would feed very nnevenly-feeding too fast in hard timber, and too slow, or not at all, in soft or rotten To enable others skilled in the art to make' and uselny invention,I will proceed. to describe ,its construction and operation; A .l

A represents thc body of the saw, on which are cut the knifeteeth D "F, planing-tecth B B, gauge-teetl1 C, and clearing-tcethE. v I

The knife-teeth D F are tiled into the frnr shown, havingtwo hevelling-faces which have knife-cdges at the-upper sides c c, and come to a sharp point at al.`

These knife-teeth are set so that the teeth D D out down one side of the kerf, and the'teeth F F down the other side. i i i The planing-teeth B. B have no set, and are filed to a sharp 4planing-edge, e, as shown.

They are arranged throughlthc saw, between sets of two or more planing-teeth, D F, and have a large spac.e,j 4left in front 0E them, where the saw-dust or chips which they plane'from the kerf accumulate and are carried to the outside of the log.

The gauge-tceth C are made with a curved knife-edge, g, arranged with reference-to the planing-teeth, as shown, their upper ends being out oit' 'by an oblique face, h. l i

They arc given such set as will cause them to follow in the path of vone set of the knife-'teeth D or F, as shownin fig. 2, and are placed, one opposite each planingtooth, excepting at the planing-tooth where the clearing-.tooth is used. I Y

The clearing-tooth E' is made with a square, rounding face, 7c, arranged with reference to the planingtootlrB', as shown. 4

There is usually but one clearing-tooth E used on a saw, but more can be usedif desirable, their function being that of carrying b ack (during the backward stroke of the saw)4 the sawdust left by the planing-teeth 1?v in the forward stroke, andthrowiug it outl at the other side of the log.

- They are placed back at a distance from the front end of the saw equal to about two-fifths tliewhole cutting-length of the saw.

The relative llength of tho several teeth is shown by red line in iig. 1, from which it is seen that all the knife-teeth D F are of the same length, vwhile the planing-.teeth B B are made a little shorter than the knifeteeth D F, but are each of the-same length.

The gauge-teeth C area'little shorter than the planing-teeth B, while the clearing-teeth E are shorter 'than the gauge-tereth. l

I Suppose, now, the saw to be moving in the direction indicated by the arrow No. 1, which represents the direction of Athe forward movement of the saw. The knife-teeth D F cut down the side of the kerf adistanco equal to or very little greater than the dierence in length between these teeth and the gauge-teeth C, and -the planing-teeth B B take off a shaving a little thicker than the di'erenee in length between the planing-teeth and the gauge-teeth E, depending on the amount the gauge-teeth cut down the side of the ke'rf, but never quite equal to the distance cut down bythe knife-teeth D F. I If the planing-teeth take toovmuch feed, the rounding edges g of the gauge-teeth C raise the saw and prev ent this undue amount of feed, the clearing-tooth E, by the action of its curved face 7c on the saw-dust in the i bottom ofthe kerf,aiding in this raising ofthe saw. h

When the saw commences to move in the 'direction shown by arrow No. 2, which shows the direction of the backward movement, the ends c c of the planing-teeth B B act as gauges to the knife-teeth D F, while the clearing-teeth E gather up the saw-dust left'by the planing-teeth B B, in the forward movement of the saw, and carry it out of the'kerf. v A

Having `thus fully described the constructionl and operation of myimproved saw, I wish it understood that I do not claim as my invention the clearing-teethE, nor the knife-teeth Dl and I", nor the planing-teeth B, nor the spacesf in front of said planing-teeth; but

What I do claim as my invention, and desire to secure by Letters Patent, is

The peculiar arrangement and combination of the knife-teeth D F,planingteeth B B, gauge-tooth C, und clearing-tooth E, on the saw-blade A, when the several parts are constructed and arranged substantially as andfor the purpose herein specified. v As evidence that I claim the foregoing, I have hereunto set my hand in the presence of two-witnesses, this 4th day of May, A. D. 1868.

. DAVID SATTLER.

Witnesses J. W. SMITH, M. H. MANSFIELD. 

